So I will list the ones that I know
T-ara - roly poly
Snsd - gee
Aoa - heart attack
Apink - mr chu (?)
2ne1 - I am the best (?)
Bigbang - bang bang bang (?)
Shinee - ring ding dong (?)
Fx - hot summer (?)
Beast - fiction
Wonder girl - tell me(?)
4minute - ????
Girl’s day - something(?)
Kara - ?????
Woah there are a lot of hits in 2nd gen huh? I don’t think I can list more groups there are too many of them 
I mostly agree but for these groups I would say:
Kara - Mister
Display MoreAoa - heart attack
Apink - mr chu
2ne1 - I am the best
Shinee - Lufcifer
Fx - Danger
Beast - fiction
Wonder girl - Nobody ?)
Girl’s day - Exception
Kara - Mister
Bangx3 is definitely bigger than Harux2
For girls day, definitely something > expectation, given the chart performance/buzz leading to success of Darling
Fx and 4minutes are arguable. Their international breakout was Electric shock and Crazy respectively. But their biggest domestic hits are Hot summer and Whats Your name respectively.
Nobody was also very HUGE in Korea. It would be:
Nobody/Tell me > So Hot > Be My Baby > Irony > 2 Different tears
Bangx3 is definitely bigger than Harux2
For girls day, definitely something > expectation, given the chart performance/buzz leading to success of Darling
Fx and 4minutes are arguable. Their international breakout was Electric shock and Crazy respectively. But their biggest domestic hits are Hot summer and Whats Your name respectively.
Okay I just name the song who was the most rememberable for me but I guess you are right 
Display MoreMore groups:
2pm: ?
TVVQ-Mirotic
BEG: Abracadabra (stream Brown Eyed Girls)
T-ARA: roly Poly
UKiss:
Beast:
2PM: Heartbeat or Again & Again
U-Kiss: Man Man Ha Ni
Display MoreSo I will list the ones that I know
T-ara - roly poly
Snsd - gee
Aoa - heart attack
Apink - mr chu (?)
2ne1 - I am the best (?)
Bigbang - bang bang bang (?)
Shinee - ring ding dong (?)
Fx - hot summer (?)
Beast - fiction
Wonder girl - tell me(?)
4minute - ????
Girl’s day - something(?)
Kara - ?????
Woah there are a lot of hits in 2nd gen huh? I don’t think I can list more groups there are too many of them
kara - Mister 
I think 3rd gen starts with the 2012 debuts though? There are alot of popular groups that debuted in 2012, Exo, Btob, Aoa, Exid to name some and usually a new gen begins with a new wave of popular groups or a shift in popularity from older groups to newer groups.. Also most people consider Exo 3rd gen to my knowledge, so it should follow that any other 2012 debuts are also 3rd gen
I think 3rd gen starts with the 2012 debuts though? There are alot of popular groups that debuted in 2012, Exo, Btob, Aoa, Exid to name some and usually a new gen begins with a new wave of popular groups or a shift in popularity from older groups to newer groups.. Also most people consider Exo 3rd gen to my knowledge, so it should follow that any other 2012 debuts are also 3rd gen
I see it as BGs 3rd Gen started with EXO/BTOB in 2012, and GGs started with Red Velvet and Mamamoo in 2014. 2013 was like an empty year because there weren't that many notable debuts for GGs
For me the shifts in generation for GGs and BGs were different. You see a lot of people compare EXO/BTOB who debut in 2012 with other 3rd Gen groups like BTS/GOT7/MONSTA X/SVT, but you see people comparing AOA/EXID to their 2nd Gen counterparts like Sistar/Girl's Day/4Minute
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